Reflector-polishing machine



' J. C. FOX

REFLECTOR POLISHING MACHINE Dec. 1

3 Sheets-Sheet 1 Filed Dec. '7, 1923 INVENTOR Ja/m @fbx WITNESSES:

ATTORNEY Jo/m 6. FOX BY 5 2 5 a R 3 e O 6 a .m 5 E s V 3 E N I H w .MQQWxm 01' FW 0L0 e C J ww l C F L F E R 5 2 9 S. 1 E S S .1 E N h W Dec.

/ ATTORNEY J. C. FOX

REFLECTOR POLISHING MACHINE Filed Dec. 7. 1923 3 Sheets-Sheet 3 INVENTORJo/m G/ox BY WITNESSES:

ATTC JRNEY Patented Dec. l, 125.

A 1,563,355 OFFICE.

JOHN 0. FOX, 01? MANSFIELD, OHIO, ASSIGNOB TO WESTINGHOUSE ELECTRIC &MANU- FACTURING COMPANY, A CORPORATIQN OF PENNSYLVANIA.

REFLECTOR-POLISHING MACHINE.

Application filed December 7, 1923. Serial No. 679,072.

To all whom it may concern:

Be it known that I, JOHN C. Fox, a citizen of the United States, and aresident of Mansfield, in the county of Riohland and State of Ohio, haveinvented a new and useful Improvement in Reflector-Polishing Machines,of which the following is a specification.

My invention relates to polishing machines and particularly to machinesfor polishing the inner surfaces of concave metal reflectors.

The object of my invention is to provide a relatively simple and compactstructure for polishing the inner surfaces of concave reflectors.

In practicing my inventioml provide a base upon which a chuck support isadjustably mounted. A chuck for holding the concave reflectors ismounted upon the said support and it is vertically adjustable relativelythereto and is also tiltable thereon. A motor is mounted-upon saidsupport and is efiective to cause the chuck and a reflectorheld therebyto rotate around the axis thereof.

A base plate is pivotally associated with said chuck base and carries amotor-supporting plate that is pivotally adjustable thereon. A motor ismounted on said plate and carries a circular polishing brush; A springmember is associated with the base plate and the motor-supporting plateto yielding- 1y hold the latter against an adjustable stop whereby theproper pressure of the brush against the inner surface of the brush isobtained and wear of the brush is compensated.

A motor-o erated means is operatively associated wit the base of thechuck and is effective to'cause the motor driven brush to oscillatearound the pivot of the base plate whereby the entire inner surface of acon-' cave reflector is o eratively engaged by the brush and is polis edthereby. I

In the drawings, Figure 1 is a top plan view of a device embodying myinventlon,

Fig. 2 is a view in side elevation thereof, Fig. 3 is a view in endelevation thereof, 7 Fig. 4 is 'a partial view of means for actuatingthe chuck-clamping means, and

Fig 5 is a fragmentary enlarged plan view of a chuck. I

A base for a chuck-sup orting means and a chuck comprises a be plate 11that is mounted on a plurality of suitable supporting members 12, boththe bed-plate and the supports being made relatively massive and heavy.

A chuck-support-aggregate is adjustably 'mounted on the bed plate 11,and comprises a member 13, of substantially tubular form,

that is provided with integral laterally ex-- tending flanges 14 adaptedto e located in suitable guide ways and provided in the bed plate 11.Clamping bars. 15 are provided to operatively engage the upper surfaceof the flanges 14. and properly hold the member 13 relatively to thebase 11, while permitting it to be moved back and forth thereon.

A chuck support 16 is fitted, into the tubularmember 13 within which itmay be adjusted in a vertical direction by means of a hand wheel 17operatively engaging a screw-threaded 'portion 18 provided on a lowerend of the member 16. As any suitable means may be provided foreffecting vertical adjustment of the member 16 relatively to the member13, the details of construction are not further described, particularlyas they form no part of my invention.

A horizontally extending portion 19 of the chuckv support has anintegral depending portion 21 operatively engaging the upper end of themember 16 and pivotally mounted thereon so that it maybe tilted up ordown relatively to the portion 16. The member 19 is of substantiallytubular form and carries an inner tubular member 22 to one outerend ofwhich a chuck 23 is suitably secured.

The chuck is of substantially bowl shape and is of such form anddimensions as to receive therein and hold, by means to be hereinafterdescribed, a concave metal reflector, the inner surface of which is tobe polished. The other end of the tubular member 22 has mounted thereona worm wheel 24 that is operatively engaged by a necting the motorpulley and the pulley 27-.

Means for holding a concave reflector in its proper operative positionwithin the .chuck 23 may comprise expanding jaws 31, of any suitable ordesired type, that are actuated by a rod 32 extending through the innertubular member 22, a member 33 of conical shape being provided tooperatively engage the jaws 31 and force them outwardly against theinner surface of an axial opening provided in the concave refiectormember.

Means for moving the rod 32 may comprise a collar 34,'movably mountedon. the tubular member 22, that is actuated by a handle 35 pivotallymounted on a support 36 that is secured to the depending portion 21 ofthe member 19. The movable collar 34 has a reduced end portion that isadapted to operatively engage two actuating arms 37, each ofsubstantially L-shape, that are mounted on a fixed collar member 39,suitably secured on the rear end of the tubular member 22. The innerends of the respective members 37, of substantially L-shape, operativelyengage the rod 32 in a suitable groove provided therein in order to moveit longitudinally relatively to the member 22.

WVhile I have illustrated and described a specific embodiment of aholding means, I do not desire to be limited thereto, as any suitable ordesired type of holding means may be employed so long as it is manuallyoperable and is effective to securely hold a concave reflector memberwhen located in its proper operative position within the chuck 2 Thebase 11 is provided with an integral extension 41, of substantiallyL-shape, the outer end of which is of such shape as to receive aball-bearing 42 and a pivot pin 43 extending therethrough. A base plate44 has a portion of the ball-bearing 42 operatively associated therewithand is thereby pivotally operatively connected. to the base 11. Theouter end of the base plate 44 rests upon a plurality of supportingmembers 45, of substantially U-shape, to the top of which is secured amember 46, of substantially arcuate form and of channel section. Aplurality of roller members 47 are suitably mounted in the member 46upon which the base plate 44 may move with relatively little friction.

A motor-supporting plate 48 is mounted on top of the base plate 44 andis pivotally secured thereto by a pivot pin 49 and aco-operatingball-bearing 51 located therebetween. The pivot pin 49 is located atthat end of the base plate offset to the pivot pin 43.

A motor 52 is secured to the top of the motor supporting plate 48 bysuitable supports 53, which may be of any suitable or desired type tohold the motor shaft in substantially the same height as the axis of thechuck 23. A circular brush 54 is suit-' ably mounted on and connected tothe end of the shaft of the motor 52.

Means for yieldingly holding the motorsupporting plate against the innersurface of a concave reflector may comprise a spring butterfly nut 59may be mounted thereon to permit of adjusting the tension of the spring55. A member 61 is mounted on the base plate 44 and permits of adjustingthe movement of the motor-supporting plate relatively to the base plate44. A plurality of roller bearings 47 may be provided in or on the baseplate 44 to ensure that the motor-supporting plate may move freelyrelatively to the base plate under the action of the spring 55.

Means for oscillating the circular brush, the motor-supporting plate andthe base plate relatively to the extension 41 and the base plate 11 maycomprise a lever 62 that is suitably secured to the pin 43 which is, inturn, secured to the base plate 44 and has a fixed position relativelythereto.

At' its outer end, the lever 62 is pivotally connected to a link 63 thatmay be made adjustable as regards its length and that has its other endconnected to a lever 64 that is suitably fixedly secured to the top of ashort-vertically extending shaft 65.

The lower end of the shaft 65 has mounted thereon a worm wheel 66 thatis operatively engaged by a worm 67. The worm 67 is mounted on a shaft68 that has also mounted thereon adjacent to the outer end thereof aworm wheel 69 that is operatively engaged by a worm 71 that is mountedon the end of the shaft of a motor 72. The shaft 65, the worm wheel 66and the worm 67 are mounted in a suitable housing 73 that is suitablysecured against one of the supports '12 by a plurality of bolts 74.

As it is desired to move the chuck and the chuck-support relatively tothe base, an operating hand lever 75 has one end thereof pivotallymounted on the bed plate 11 and is connected to the chuck support by alink 76 that has one end pivotally connected to the lever 75 and theother end to the chuck support 13. The hereinbefore describedconstruction of bed plate permits of easily and quickly moving thechuck, the motor and the chuck support relatively to the plate 11,toward and away from the eircular brush by means of the hand lever Meansfor limiting the movement of the chuck and the parts immediatelyassociated therewith toward the circular brush are provided and maycomprise a substantially.

i horizontall extending shaft 77, the inner end ofwhich is constructedas a stop' for the lower part of the portion 13 when moved v The centerline. of the shaft of the motor '52 is located in ofl'set'position in avertical plane, relatively to the vertical plane of the axis of thechuck 23 inorder to permit the .proper operative position of the brush54 relatively to the'chuck 23 and ,to the reflector member locatedtherein. This "offset position may be varied as required by the relativedimensions of the brush 54 and the reflector member located in the chuck23,

1 by means of the spring member 55 and the stop member 61.

It may be noted also that the pivotal mounting'of the motor supportingplate on the base plate is offset from the center line of the shaftofthe motor 52.

The device embodying my invention thus provides a relatively simple andcompact structure having a chuck within which a concave metal reflectormember may be easily I and quickly mounted and which may be so moved asto cause the inner surface of thereflector member to be operativelyengaged by a rotating circular brush. Meansare provided by the device-embodying my nventionv for rotating the chuck and the reflector member ata relatively low speed and for rotating the-circular brush at arelativelyhigh speed.

The circular brush together with parts of the mechanism operativelyassociated therewith are given 'an oscillating motion by meansoperatively associated with the base plate of the chuck to they eifectthat all of the inner surface of the reflector shall be operativelyengaged by the circular brush and thereby become highly polished. All ofthe members are adjustable relatively to the other portions of thestructure in order that various sizes of reflectors may be polished,various sizes of circular brushes be employed, andthat wear of thecircular brush may be easily and quickly compensated. F 1

Various modifications and changes may be made without departing'from,the spirit and scope of the invention, I desire, therefore that onlysuch limitations shall be placed thereon as are imposed by the prior artor are set forth in the appended claims.

I claim as my invention: 1. In a reflector-polishing machine, in

combination, a base, arotatable chuck for holding a concave reflectorthe inner surface of which is to be polished, 'adjustably mounted on'said base, a base plate having a pivotal mounting on said chuck base, amotor-supporting I plate pivotally mounted on said base plate, a motormounted on said moving said chuck toward. said brush, and meansoperativelyassociated with said chuck-base for causing-oscillatorymovement of said"base-plate, motor and brush around said-pivotalmounting.

' motor-supporting plate, a circular. brush on sa1d motor, means on saidchuck-base for- 2. In arefiector-polishing machine, in a combination, abase, a rotatable chuck for holding a concave reflector, the innersurface of which is to be polished, adjustably mounted on said base,-abase plate having a pivotal mounting on said chuck base, amotor-supporting plate pivotally mounted on said base plate, a motormounted on said motor-supporting plate, a circular brush on said motor.-means on said chuck-base for movlng sa1d chuck toward sa1d brush,

means. operatively associated with said. chuck-base for causingoscillatory mov ment ofjsaid base-plate, motor and brus around saidpivotal mounting and means associated with said base plate foryieldingly holding the peripheral surface of said brush against areflector mounted in said chuck.

In testimony whereof, I have hereunto subscribed my name this lst day ofDecember1923.

JOHN o. rox.

